Segmented roller briquette press with cooled mounting rings

ABSTRACT

An improved roller-type briquette press for the hot pressing of coal, ores and similar substances, wherein a cylindrical roller core carries a plurality of segments, equipped with molds and forming together an annulus, wherein the improvement comprises that the segments may be easily and reliably mounted on the valve core even at the high temperatures encountered during the pressing by using cooled, shrunk fit mounting rings.

lliiiied States Patent Bergendnlil [54] SEGMENTED ROLLER BRIQUETTE PRESS WITH C'OUlLED MUUNTMNG RMNGS [72] Inventor: Hans-Georg Bergentllalhl, Langehorst 23,

Hattingen (Ruhr), Germany [22] Filed: June 2,1970

[21] App]. No.: 42,695

[30] Foreign Application Priority Data June 3, 1969 Germany ..P 19 28 176.6

[52] U.S. Cl ..425/363, 29/447 [51] Int. Cl. ..B29c 3/02 [58] Field oiSearcll ..25/77, 76; 18/21, 9; 29/447,

29/DIG. 35

[56] References Cited UNITED STATES PATENTS Kirby et a1. ..29/447 X 2,958,902 1 1/1960 Decker et a1. ..18/2l 2,958,903 11/1960 Decker ..18/21 FOREIGN PATENTS OR APPLICATlONS 213,035 8/1955 Australia 1 8/21 Primary Examiner-Robert D. Baldwin Attorney-Craig, Antonelli and Hill [5 7] ABSTRACT An improved roller-type briquette press for the hot pressing of coal, ores and similar substances, wherein a cylindrical roller core carries a plurality of segments, equipped with molds and forming together an annulus, wherein the improvement comprises that the segments may be easily and reliably mounted on the valve core even at the high temperatures encountered during the pressing by using cooled, shrunk fit mounting rings.

3 Claims, 5 Drawing Figures PAHNTEB M 1 8 m2 SHFEI 1 OF 2 Fig.2

Inventor: HA NS GEoRG BERGENDAHL BY C ulj, HnIbnellL Stewart =1- Hi ATTDRN E Y5 Pm'zmmmmz 3,635,837

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Inventor:

HANS GEORG BERGEN DAHL BY (lo-L3, QnISn IU, Steuqrk "1' ATTORNEYS SEGMENTED ROLLER BIRIQUETTE PRESS WllTllll COOLED MOUNTING RINGS DESCRIPTION The invention relates, as indicated, to a roller-type briquette press for the hot pressing of coal, ores and similar substances, in which a cylindrical roller core carries a plurality of segments equipped with molding recesses and forming together an annulus.

A known roller briquette press of this type, described in British Pat. No. 567,069, and not intended particularly for hot pressing, the mounting means are spring-biased pins or spring clips. Thrust forces are here transmitted by wedges or bolts. However, fixing means of this kind are unsuitable for the hot pressing of coal which takes place at temperatures about 400 C. and for the hot pressing of cores where temperatures of up to 900 C. are reached.

There are also known roller briquette presses, in which the roller core has a polygonal cross section and a segment is fitted on each face of the polygon (U.S. Pat. No. 1,357,141, German published specifications Nos. 1,037,348 and 1,064,857) in which the faces of the polygon have grooves into which engage wedged keys arranged on the segments. The segments are connected tothe roller core by means of screws, and in the German published specifications Nos. 1,037,348 and 1,064,857, the segments have lugs at their ends through which pass the screws. However, also screw connections are not reliable at the temperatures occurring during hot pressing. In addition, the polygonal cross sections require expensive machining operations of the valve core and possibly also of the base surfaces of the segments.

It is an object of the invention to provide a roller briquette press of the type hereinbefore described, which is simple to manufacture and which ensures the reliable mounting of the segments on the even valve core enve at the temperature occurring during hot pressing.

It is a further object of the invention to provide a roller briquette press of simple construction and with reliable mounting of the segments on the roller core even at the temperatures occurring during hot pressing, wherein the segments have lateral projections or lugs and the mounting means are rings shrunk on to these lugs, wherein the shrunk rings comprise an annular conduit for a coolant, and coolant channels are provided in the valve core for supplying and removing the coolant. It has been found that with briquetting rollers according to the invention the tangential forces occuring during the pressing may be transmitted completely, even at the temperatures encountered during the pressing of ores, by the friction in the cylindrical contact forces between the segments and the core. The other force components pass almost radially from the segments into the core so that no tilting forces occur in the segments. For the manufacture of the segments and the core, only turning operations are substantially quiet so that a very simple machining is possible.

Preferably, the segments are formed by cutting a turned solid annulus. In this manner, a substantially uniform loading of the bearing is achieved in that the cuts pass through the mold recesses, as known in the art. The cutting of the mold recesses in roller presses with segments, is known from US. Pat. No. l,357,141.

The cuts may be executed, as known per se, either axially parallel or at an acute angle to the axis.

In a preferred embodiment, the coolant channel is turned into the outer periphery of the shrunk ring and is covered by another ring fixed by welding. The coolant connections may be formed by bores in the shrunk ring.

In order to facilitate the alignment of the segments prior to the fitting of the shrunk rings, stop flanges are provided on the valve core for the axial positioning of the segments thereon. in addition, stop elements are preferably provided between the segments and the valve core acting in the direction of the circumference. These elements may have only small cross seetions since, as mentioned above, the tangential forces are transmitted by friction and the circumfcrentially effective stop elements are necessary merely for aligning the segments.

The invention will be further described, by way of example with reference to the accompanying drawings and in the appended claims. In the drawings:

FIG. 1 is a side elevation of a roller-type briquette press according to the invention;

FIG. 2 is a cross section along the line llll in FIG. I;

FIG. 3 is a cross section of a press rolller according to the invention, taken along the line III-Ill in FIG. 2;

FIGS. 4 and 5 show developments of the segments with axially parallel dividing lines in FIG. 4 and dividing lines forming an angle with the axis in FIG. 5.

FIG. I shows a conventional roller briquette press with a frame 2 having an opening 4 on both sides in which two bearing blocks 6, 8 are displaceably mounted; a distance member 10 is located between the bearing blocks and the bearing block 8 is supported by hydraulic cylinders enabling it to deflect laterally when a certain pressing pressure is exceeded. The shafts l8 and 20 of the rollers 14 and 16 are mounted in the said bearing blocks. The material to be pressed is supplied through a feed hopper 22.

As may be seen from FIG. 2, a the roller core 24 and the roller shaft 18 are made in one piece. The shaft I8 is mounted via roller bearings 26 in the bearing blocks 8; a drive pinion 28 is mounted on one end of the shaft 18, as known in the art.

As may be seen from FIG. 3, the circumference of the roller core 24 is clyindrical, A plurality of segments 30 are arranged on the valve core, the inner circumference of which segments is cylindrical and corresponds to the cylinder of the valve core so that they rest completely on the cylindrical core.

As indicated in FIG. 2, the projecting; center part of the segments carries on its outer circumference the mold recesses 32. Both sides of the segments are provided with extensions or projections 34. Shrunk rings 36 are fitted to the projections 34 and press the segments with the necessary force on to the core.

The outer periphery of the shrunk rings is provided with a turned coolant channel 38 which is covered and closed by an annulus 40 mounted thereon by welding. Obviously, the coolant channel 38 may also be formed by a ring with a flat U- shaped profile.

A coolant conduit is connected to the coolant channel 38 through an axial bore 42 and a radial bore 44 in the shrunk ring. Always two bores are arranged adjacently, one serving as inlet and the other as outlet. Between these bores, the coolant channel 38 is closed by a partition. The axial bore 42 communicates through a pipe 46 with a bore leading into the interior of the roller core; this bore leads to an axially parallel bore 50, terminating in a collecting head 52 at the end of the shaft I8.

As may be seen from FIG. 3, the bore 48 for the supply of the coolant, and a bore 54 for the reflux, leading into an axially parallel reflux bore 56, shown in FIG. 2 underneath the inlet bore 50, are parallel. The collecting head 52 is connected to a known rotary connecter 58.

In the embodiment shown, the valve core 24 has on both sides of the mounting face for the segments flanges 60, serving to locate the segments 30 in the lateral direction.

Between each individual segment and the valve core there are provided wedges 62, acting in the direction of the circumference. In principle, these wedges do not serve as force-transmitting elements, but as fixing means for the individual segments during the assembly.

Using the retaining action of the annular flanges 60 and the wedges 62, the individual segments can be fitted to the valve core during the assembly and retained by a tensioning ele ment. After this preassembly the heated shrunk rings 36 may be fitted.

In view of the cylindrical contact surface between the segments 30 and the core 24, substantially only turning operations are required for machining the core. Once the core is turned, it is only necessary to machine in the comparatively small keyways.

Also, the segments 30 may be produced by turning. For manufacturing the segments, a solid ring is made preferably after the manner of a tire, into which the mold recesses are sunk. The comparatively small keyways are then machined into the inner periphery of the ring. The ring prepared in this manner is then divided into the individual segments. Preferably, the cutting is effected in that manner that the cutting lines cut, as shown in FIGS. 4 and 5, through the mold recesses because in this manner irregularities in the running of the rollers during the pressing are reduced to a minimum. As shown in FIG. 4, the cutting lines may be parallel to the axis or they may form an acute angle with the axis, as shown in FIG.

The gaps, necessarily formed during the cutting of the annular tire into segments between the individual segments, enable the segments to expand at the working temperatures and to adapt themselves to the working temperature without undue stresses.

The cooling of the shrunk rings 36 ensures that their temperature will be lower than that of the segments; this ensures the firm seating of the segments on the roller core under all operational conditions and the pressing at working temperature becomes even better in view of the fact that the whole segment is heated.

Hence, the invention provides a solution for the problems occurring with all known segment mountings in which the retaining effect of the mounting is reduced when the heat rises.

I claim:

1. An improved roller-type briquette press for the hot pressing of coal, ores and similar materials including a plurality of segments equipped with mold recesses and forming together a full annulus mounted on a cylindrical valve core, wherein the improvement comprises that the segments 30 are provided with lateral projections 34 and the mounting means are rings 36 shrunk on to the said projections, said shrunk rings equipped with an annular coolant channel 38 communicating with coolant channels 48, 50, 54, 56 disposed in said core for supplying and removing the coolant.

2. A roller briquette press as set forth in claim 1, wherein the said segments are peripherally spaced apart by small expansion gaps.

3. A roller briquette press as set forth in claim 2, wherein the gaps pass through the mold recesses.

4. A roller briquette press as set forth in claim 3, wherein the said gaps are either axially parallel or form an acute angle with the roller axis.

5. A roller briquette press as set forth in claim 1, wherein the said coolant channel 38 is formed in the outer circumference of the shrunk ring and is covered by a weld-mounted ring 40.

6. A roller briquette press as set forth in claim 1, wherein coolant connections are formed by bores 42, 44 in the said shrunk ring.

7. A roller briquette press as set forth in claim 1, further comprising stop flanges 60 on the valve core for axially locating the said segments.

8. A roller briquette press as set forth in claim 1, wherein locating members acting in the direction of the circumference are provided between the segments and the valve core. 

1. An improved roller-type briquette press for the hot pressing of coal, ores and similar materials including a plurality of segments equipped with mold recesses and forming together a full annulus mounted on a cylindrical valve core, wherein the improvement comprises that the segments 30 are provided with lateral projections 34 and the mounting means are rings 36 shrunk on to the said projections, said shrunk rings equipped with an annular coolant channel 38 communicating with coolant channels 48, 50, 54, 56 disposed in said core for supplying and removing the coolant.
 2. A roller briquette press as set forth in claim 1, wherein the said segments are peripherally spaced apart by small expansion gaps.
 3. A roller briquette press as set forth in claim 2, wherein the gaps pass through the mold recesses.
 4. A roller briquette press as set forth in claim 3, wherein the said gaps are either axially parallel or form an acute angle with the roller axis.
 5. A roller briquette press as set forth in claim 1, wherein the said coolant channel 38 is formed in the outer circumference of the shrunk ring and is covered by a weld-mounted ring
 40. 6. A roller briquette press as set forth in claim 1, wherein coolant connections are formed by bores 42, 44 in the said shrunk ring.
 7. A roller briquette press as set forth in claim 1, furthEr comprising stop flanges 60 on the valve core for axially locating the said segments.
 8. A roller briquette press as set forth in claim 1, wherein locating members acting in the direction of the circumference are provided between the segments and the valve core. 